package views;

import java.util.List;

import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup.LayoutParams;

import com.example.android.google.apis.R;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.google.android.maps.OverlayItem;

/**
 * An abstract extension of ItemizedOverlay for displaying an information
 * balloon upon screen-tap of each marker overlay.
 * 
 * @author Jeff Gilfelt
 */
public abstract class BalloonItemizedOverlay<Item extends OverlayItem> extends
	ItemizedOverlay<Item> {

    private MapView mapView;
    private BalloonOverlayView<Item> balloonView;
    private View clickRegion;
    private int viewOffset;
    final MapController mc;
    private Item currentFocussedItem;
    private int currentFocussedIndex;

    // Not in the original code (Adria)
    private Drawable marker;

    /**
     * Create a new BalloonItemizedOverlay
     * 
     * @param defaultMarker
     *            - A bounded Drawable to be drawn on the map for each item in
     *            the overlay.
     * @param mapView
     *            - The view upon which the overlay items are to be drawn.
     */
    public BalloonItemizedOverlay(Drawable defaultMarker, MapView mapView) {
	super(defaultMarker);
	this.mapView = mapView;
	viewOffset = 0;
	mc = mapView.getController();

	// Not in the original code (Adria)
	this.marker = defaultMarker;
    }

    /**
     * Set the horizontal distance between the marker and the bottom of the
     * information balloon. The default is 0 which works well for center bounded
     * markers. If your marker is center-bottom bounded, call this before adding
     * overlay items to ensure the balloon hovers exactly above the marker.
     * 
     * @param pixels
     *            - The padding between the center point and the bottom of the
     *            information balloon.
     */
    public void setBalloonBottomOffset(int pixels) {
	viewOffset = pixels;
    }

    public int getBalloonBottomOffset() {
	return viewOffset;
    }

    @Override
    public void draw(Canvas canvas, MapView mapView, boolean shadow) {
	super.draw(canvas, mapView, false);
    }

    /**
     * Override this method to handle a "tap" on a balloon. By default, does
     * nothing and returns false.
     * 
     * @param index
     *            - The index of the item whose balloon is tapped.
     * @param item
     *            - The item whose balloon is tapped.
     * @return true if you handled the tap, otherwise false.
     */
    protected boolean onBalloonTap(int index, Item item) {
	return false;
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.google.android.maps.ItemizedOverlay#onTap(int)
     */
    @Override
    protected final boolean onTap(int index) {

	currentFocussedIndex = index;
	currentFocussedItem = createItem(index);

	boolean isRecycled;
	if (balloonView == null) {
	    balloonView = createBalloonOverlayView();
	    clickRegion = (View) balloonView
		    .findViewById(R.id.balloon_inner_layout);
	    clickRegion.setOnTouchListener(createBalloonTouchListener());
	    isRecycled = false;
	} else {
	    isRecycled = true;
	}

	balloonView.setVisibility(View.GONE);

	List<Overlay> mapOverlays = mapView.getOverlays();
	if (mapOverlays.size() > 1) {
	    hideOtherBalloons(mapOverlays);
	}

	balloonView.setData(currentFocussedItem, index, this);

	GeoPoint point = currentFocussedItem.getPoint();
	MapView.LayoutParams params = new MapView.LayoutParams(
		LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, point,
		MapView.LayoutParams.BOTTOM_CENTER);
	params.mode = MapView.LayoutParams.MODE_MAP;

	balloonView.setVisibility(View.VISIBLE);

	if (isRecycled) {
	    balloonView.setLayoutParams(params);
	} else {
	    mapView.addView(balloonView, params);
	}

	mc.animateTo(point);

	return true;
    }

    /**
     * Creates the balloon view. Override to create a sub-classed view that can
     * populate additional sub-views.
     */
    protected BalloonOverlayView<Item> createBalloonOverlayView() {
	return new BalloonOverlayView<Item>(getMapView().getContext(),
		getBalloonBottomOffset() + marker.getBounds().height());
    }

    /**
     * Expose map view to subclasses. Helps with creation of balloon views.
     */
    protected MapView getMapView() {
	return mapView;
    }

    /**
     * Sets the visibility of this overlay's balloon view to GONE.
     */
    protected void hideBalloon() {
	if (balloonView != null) {
	    balloonView.setVisibility(View.GONE);
	}
    }

    /**
     * Hides the balloon view for any other BalloonItemizedOverlay instances
     * that might be present on the MapView.
     * 
     * @param overlays
     *            - list of overlays (including this) on the MapView.
     */
    private void hideOtherBalloons(List<Overlay> overlays) {

	for (Overlay overlay : overlays) {
	    if (overlay instanceof BalloonItemizedOverlay<?> && overlay != this) {
		((BalloonItemizedOverlay<?>) overlay).hideBalloon();
	    }
	}

    }

    /**
     * Sets the onTouchListener for the balloon being displayed, calling the
     * overridden {@link #onBalloonTap} method.
     */
    private OnTouchListener createBalloonTouchListener() {
	return new OnTouchListener() {
	    public boolean onTouch(View v, MotionEvent event) {

		View l = ((View) v.getParent())
			.findViewById(R.id.balloon_main_layout);
		Drawable d = l.getBackground();

		if (event.getAction() == MotionEvent.ACTION_DOWN) {
		    int[] states = { android.R.attr.state_pressed };
		    if (d.setState(states)) {
			d.invalidateSelf();
		    }
		    return true;
		} else if (event.getAction() == MotionEvent.ACTION_UP) {
		    int newStates[] = {};
		    if (d.setState(newStates)) {
			d.invalidateSelf();
		    }
		    // call overridden method
		    onBalloonTap(currentFocussedIndex, currentFocussedItem);
		    return true;
		} else {
		    return false;
		}

	    }
	};
    }

}